I am a bit confused. I thought that when it comes to paring that you just pair T's with the A's and A's with the U's. And of course- C's with G's and G's with C's. I am greatly confused :( there are roughly 10 problems similar to the question above that are due tomorrow. I was hoping to use this question as a template for my other questions. Can you or anyone please be more specific as to what is wrong? Thanks!

When you talking about RNA, the base pair are A, U (instead of T), G and C.

You pairing is fine but you have to make sure that you are using the right base pair. If the question asks about DNA, you sequence should have T's and not have U's. If the question asks about RNA, then your sequence should U's instead of the T's.

Codon's for amino acid are encoded by transfer RNA so the sequence will have U. Therefore when the question ask about the DNA sequence, you cannot use the codon sequence as is, you must change U's for T's.